Appendix. 519 



USES. 



An excellent insecticide for aphis, psylla, cuckoo spit insects, leaf 

 hoppers, and thrips. It is also to some extent a repellant or insectifuge, 

 and for this purpose might be sprayed over unopened or opened blossom 

 to prevent egg-laying by pear midge and apple sawfly Nothing definite, 

 however, can be said on this point. 



It may be obtained in the form of a powder-tobacco, which has been 

 denatured, in bond at 20s. per cwt., or if the leaf is used, any of the 

 coarser tobacco will do, at about 3s. Qd. per Ib. If powder is employed a 

 much greater quantity is necessary than if the leaf, but the former, being 

 so much cheaper, is recommended. Messrs. Voss and Co. send out a 

 tobacco extract, 1 Ib. of which equals 3 Ibs. of tobacco and makes 10 

 gallons of wash. 



TIME OF APPLICATION. 



For aphis and apple sucker in early spring, best just after the buds 

 have burst. For thrips, etc., in May and June. It may be used at any 

 time even on opened blossom. 



Hellebore Wash. 



(The root of Veratrum album.) 



FORMULA. 



Fresh Hellebore Powder . . . . 2 Ibs. 

 Water 10 galls. 



PREPARATION. 



Obtain the best fresh ground hellebore and merely mix it with water 

 and keep constantly agitated. 



USES. 



For the destruction of all sawfly larvie. 



TIME OF APPLICATION. 

 This varies according to the species of sawfly. 



Pyrethrum Wash. 



(The flowers of Pyrethrum spp.) 



FORMULA. 



Pyrethrum 2 to 8 Ibs. 



Water 10 galls. 



